Thumb Score: +8 On the EcoFlow ebay store. Choose the "EcoFlow 800W Alternator Charger with Power Station Certified Refurbished" or use the link: https://www.ebay.com/itm/14585291...MQ46RM2084 From the dropdown, choose the Alternator Charger and add to cart. At checkout, use the code ECOFLOWJULY21 for 21% off, making it $315.21 The code works for other things, too, but this is the first time I've seen a code work for the alternator charger. Should work with the Delta 2, Delta 2 Max, Delta Max 2000, Delta Pro, and Wave 2 battery